1321090663 has 2 divisors, whose sum is σ = 1321090664. Its totient is φ = 1321090662.

The previous prime is 1321090651. The next prime is 1321090717. The reversal of 1321090663 is 3660901231.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321090663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321090633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660545331 + 660545332.

It is an arithmetic number, because the mean of its divisors is an integer number (660545332).

Almost surely, 2^1321090663 is an apocalyptic number.

1321090663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321090663 is an equidigital number, since it uses as much as digits as its factorization.

1321090663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1321090663 is about 36346.8109054976. The cubic root of 1321090663 is about 1097.2633523422.

Adding to 1321090663 its reverse (3660901231), we get a palindrome (4981991894).

The spelling of 1321090663 in words is "one billion, three hundred twenty-one million, ninety thousand, six hundred sixty-three".